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Table 1 Patients backgrounds at base line for orthopaedic surgery

From: Biologic-free remission by orthopaedic surgery in non-responder to infliximab for rheumatoid arthritis

N	74
Age (years)	60.4 ± 1.05
Female (%)	65/74 (87.8 %)
DD (years)	12.29 ± 11.78
DAS28(CRP)	4.32 ± 0.71
CRP (mg/dl)	2.67 ± 3.22
MTX (mg/week)	6.02 ± 1.17
PSL (mg/day)	3.68 ± 2.29
Stage/class	II; 16, III; 40, IV; 18/2; 20, 3; 46, 4; 8
Infliximab (years)	1.15 ± 0.53
Orthopaedic surgery	Synovectomy 38
	Arthroplasty 20
	Others 16

DD disease duration, DAS disease activity score, CRP c-reactive protein, MTX methotrexate, PSL predonisolone

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